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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/vue.js"></script>
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<body>
    <div id="app">

    </div>
    <script>
        var vm=new Vue({
        el:'#app',
        data:{
            val:"简单对象初始值",
            obj:{
                name:"复杂对象name",
                value:"复杂对象value",
            }
        },
        watch:{
            //watch监听器监听的值对应的函数的参数可加可不加，看需要
            val:function(newval,oldval){
        console.log(newval,oldval);
                console.log(this.val)
            },
            //对于复杂对象的监听方式
            obj:{
                deep:true,
                handler:function(new_val,old_val){
                    console.log(new_val,old_val)
                }
            }
        }
        })
    </script>
</body>
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